Wrench.



No. 783,845. PATENTED FEB. 28, 1905. J. MUNRO.

WRENCH.

APPLIOATIOH FILED HOV.23,1904.

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W (W B WITNESSES:

Kilo. 783,845..

Ira'tenteot February 28, 1905.,

Trait tllri icni JOHN MUNRO, OF NEW YORK, N. Y.

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SPECIFICATION forming part of Letters Patent No. 783,845, dated. February 28, 1905.

Application filed November 28, 1904.. Serial No. 233,962.

To all whom, (It may con/0117mm Be it known that I, JonN lvlnnno. a subject of the King of Great Britain, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, haveinvented a new and Improved l Vrench, of which the following is a full, clear, and exact description.

The invention relates to wrenches having a fixed and a movable jaw; and its object is to provide a new and improved wrench arranged to permit convenient, quick, and minute adjustment of the movable jaw relative to the fixed jaw and to provide a long range of movement for the movable jaw to allow engaging large and small articles with lirm gripping power.

The invention consists of novel features and parts and. combinations of the same, as will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a side elevation of the improvement, parts being in section. Fig. 2 is an enlarged transverse section of the same on the line 2 2 of Fig. 1. Fig. 3 is a like View of the same on the line 3 3 of Fig. 1. Fig. 4 is an enlarged plan view of part of the mutilated rock-stem, and Fig. 5 is a transverse section of the same.

1 he jaw A is lixed on one end of a shank B, provided With the usual handle U, and on the said shank B is mounted to slide longitudinally a movable jaw D, provided with a mutilated nut D, engaged by a mutilated thread E on a rock stem or spindle E, having a head E, provided with shoulders E E", adapted to abut against the sides of the shank B (see Fig. 3) to limit the turning motion of the said rockstem. A spring F, held on the head E between the shouldcrs E and E, serves to hold the rock-stem in either of its two principal positions to prevent accidental turning of the rock-stem.

The rock-sten1 E is formed with a central nut in which screws a screw-rod Gr, havingits outer reduced end (i journaled in a suitable bearing formed on an abutment H, arranged on the handle C, and on the said screw-rod (i is secured or formed a head ii", extending into a notch B, formed in the top of the shank B and serving to prevent longitudinal movement of the said screw-rod (i.

N hen the head E of the rock-stem E is turned to the position shown in Fig. 3 --that is, until its shoulder E abuts against one side of the shank B----then the mutilated threads of the nut l) and the rock-stcm E are out of alinement with each other to allow sliding of the movable jaw l) lengthwise on the rockstem E to bring the movable jaw I) about in the proper position relative to the fixed jaw A and to the size of the object to be gripped by the wrench. Vt lum this has been done. the operator turns the head E until the shoulder E abuts against the other side of the shank B, and in doing so the mutilatcdtln'ezuls of the rock-stem E move in engagement with the mutilated threads of the nut ll to hold the movable jaw l) against longitudinal movement on the said rock-stein.

In order to obtain final and minute adjustment of the movable jaw I), the operator turns the head (i so as to turn the screw-rod (i, and as the latter screws in the rock-stem E it is evident that longitudinal movement is given to the rock-stem E and to the movable jaw l) locked thereon to bring the said movable jaw into lirm engagement with the object to be gripped.

When it is desired to release the object, it is only necessary for the operator to turn the head Ur in a reverse direction to back oili the stem E and the jaw D.

From the foregoing it will be seen that a long range of movei'nent is provided for the movable jaw D and the latter can be conveniently and quickly moved forward or backward on the stem E and then looked thereto by a slight turning movement of the stem, and final minute adjustment can be had by turning the screw-rod G.

The wrench described is composed of but few parts not liable to easily get out of order and which can be cheaply manufactured and readily assembled.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A wrench comprising a fixed jaw having a handled shank, a movable jaw slidable on the shank, a rock-stem having a limited turning movement and slidably engaged by the said jaw and adapted to be locked thereto, and a screw-rod separate from the stem and engaging the same for adjusting it in the direction of its length.

2. A wrench comprising a fixed jaw having a handled shank, a movable jaw, a rock-stem for the movable jaw to slide on and to be held against longitudinal movement thereon, and a screw-rod screwing lengthwise in the said rock-stem.

3. A wrench comprising a fixed jaw having a handled shank, a movable jaw, a rock-stem for the movable jaw to slide on' and to be held against longitudinal movement thereon, and a screw-rod screwing lengthwise in the said rock-stem, the latter having a head provided with spaced shoulders adapted to abut against opposite sides of the said shank.

4. A wrench comprising a fixed jaw having a handled shank, a movable jaw, a rock-stem for the movable jaw to slide on and to be held against longitudinal movement thereon, a

l screw-rod screwing lengthwise in the said rock-stem, the latter having a head provided with spaced shoulders adapted to abut against opposite sides of the said shank, and a spring pressing the said head, to hold therock-stem against accidental turning movement.

5. A wrench comprising a fixed jaw having a handled shank, a movable jaw having a mutilated nut, a rock-stem having a mutilated screw-thread for engagement with the said nut, and a screw-rod screwing in the said rockstem.

6. A wrench comprising a fixed jaw having a handled shank, a movable jaw having a mutilated nut, a rock-stem having a mutilated screw-thread for engagement with the said nut, a screw-rod screwing in the said rockstem, and means for turning the said rockstem and the said screw-rod independent one of the other.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN MUN R0.

Witnesses:

THEo. Gr. HosTER, EVERARD BOLTON MARsHALL. 

